From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE6B3C433E0 for ; Mon, 10 Aug 2020 19:20:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9569C206C3 for ; Mon, 10 Aug 2020 19:20:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597087225; bh=ViljuQSUBMMS87DdQO2cmP6a8sHOqnJUa5dXv1gAFO4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0jMOfJqNZQgVF6jFl6RtYJ3mjjKCfIlum2LaW2tYk/A9s/eBx7xHJMbCiQ/+oTlV5 lGvUWJJZjJEj07hJq/t1guRKACodkPe3sNIH27GQHBfbDB1WH6T8FyJhQjmWSwMEb3 GFz7Ict5M+gsJa+rf46HtYJGDYSd4+agcHjtBJV0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729555AbgHJTUX (ORCPT ); Mon, 10 Aug 2020 15:20:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:45470 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729887AbgHJTNy (ORCPT ); Mon, 10 Aug 2020 15:13:54 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 47FBE207FF; Mon, 10 Aug 2020 19:13:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597086834; bh=ViljuQSUBMMS87DdQO2cmP6a8sHOqnJUa5dXv1gAFO4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RSmaxlwhkFOGAPb59ayY/RJ2KS9nlfxhLFCfU4yPSouDymXZBJVO/OFFRXcmSGaKV wgmkBiVChT6bQyYklWZktuxKci1Lo0a7rO96NvhRkAJw1EmjzH0gDuXzV2CHYqrQVE f6fTAGxJqoCEHgiK8yeNAoTH2MFKtQA13dfKkMlM= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zhao Heming , Song Liu , Sasha Levin , linux-raid@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 06/22] md-cluster: fix wild pointer of unlock_all_bitmaps() Date: Mon, 10 Aug 2020 15:13:28 -0400 Message-Id: <20200810191345.3795166-6-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200810191345.3795166-1-sashal@kernel.org> References: <20200810191345.3795166-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhao Heming [ Upstream commit 60f80d6f2d07a6d8aee485a1d1252327eeee0c81 ] reproduction steps: ``` node1 # mdadm -C /dev/md0 -b clustered -e 1.2 -n 2 -l mirror /dev/sda /dev/sdb node2 # mdadm -A /dev/md0 /dev/sda /dev/sdb node1 # mdadm -G /dev/md0 -b none mdadm: failed to remove clustered bitmap. node1 # mdadm -S --scan ^C <==== mdadm hung & kernel crash ``` kernel stack: ``` [ 335.230657] general protection fault: 0000 [#1] SMP NOPTI [...] [ 335.230848] Call Trace: [ 335.230873] ? unlock_all_bitmaps+0x5/0x70 [md_cluster] [ 335.230886] unlock_all_bitmaps+0x3d/0x70 [md_cluster] [ 335.230899] leave+0x10f/0x190 [md_cluster] [ 335.230932] ? md_super_wait+0x93/0xa0 [md_mod] [ 335.230947] ? leave+0x5/0x190 [md_cluster] [ 335.230973] md_cluster_stop+0x1a/0x30 [md_mod] [ 335.230999] md_bitmap_free+0x142/0x150 [md_mod] [ 335.231013] ? _cond_resched+0x15/0x40 [ 335.231025] ? mutex_lock+0xe/0x30 [ 335.231056] __md_stop+0x1c/0xa0 [md_mod] [ 335.231083] do_md_stop+0x160/0x580 [md_mod] [ 335.231119] ? 0xffffffffc05fb078 [ 335.231148] md_ioctl+0xa04/0x1930 [md_mod] [ 335.231165] ? filename_lookup+0xf2/0x190 [ 335.231179] blkdev_ioctl+0x93c/0xa10 [ 335.231205] ? _cond_resched+0x15/0x40 [ 335.231214] ? __check_object_size+0xd4/0x1a0 [ 335.231224] block_ioctl+0x39/0x40 [ 335.231243] do_vfs_ioctl+0xa0/0x680 [ 335.231253] ksys_ioctl+0x70/0x80 [ 335.231261] __x64_sys_ioctl+0x16/0x20 [ 335.231271] do_syscall_64+0x65/0x1f0 [ 335.231278] entry_SYSCALL_64_after_hwframe+0x44/0xa9 ``` Signed-off-by: Zhao Heming Signed-off-by: Song Liu Signed-off-by: Sasha Levin --- drivers/md/md-cluster.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c index 10057ac85476e..035d5ec8e677f 100644 --- a/drivers/md/md-cluster.c +++ b/drivers/md/md-cluster.c @@ -1423,6 +1423,7 @@ static void unlock_all_bitmaps(struct mddev *mddev) } } kfree(cinfo->other_bitmap_lockres); + cinfo->other_bitmap_lockres = NULL; } } -- 2.25.1